Non-mesonic decay of the $η$-mesic $^{3}\hspace{-0.03cm}\mbox{He}$ via $pd\rightarrow(^{3}\hspace{-0.03cm}\mbox{He}$-$η)_{bound}\rightarrow$ $^{3}\hspace{-0.03cm}\mbox{He} 2γ(6γ$) reaction
In this article a theoretical model for the $η$-mesic $^{3}\hspace{-0.03cm}\mbox{He}$ non-mesonic decay channels is presented. We present the resultant relative momentum distribution of bound $^{3}\hspace{-0.03cm}\mbox{He}$-$η$ as well as in-medium branching ratios of $η\rightarrow 2γ$ and $η\rightarrow 3π^0$, which are crucial for the Monte Carlo simulations of measured processes and thus for the experimental data interpretation. As an example we also apply the model for the estimation of the detection efficiency of the WASA-at-COSY detector.
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